To add a tip, you have 3 choices:
1) Members: log in to add a tip
2) Non-members: register and all future tips will be added instantly
3) Non-members: suggest a tip without registering (but we'll need to check it first)

If you find that a particular App is sending you too many notifications, there is a quick way to disable these.

When you receive the notification, pull down the notification screen. Then long press on the notification. You should see a small ‘i’. Press this and you should see the notifications specific to that App.